[ARC5] Visual alignment of BC-454 - more photos

[Ian Wilson]

Signal generator + counter gives you a very nice frequency reference
marker. Makes it easy to measure the edges/centre even if the display
isn't perfect.

73, ian K3IMW



On Thu, May 23, 2013 at 3:36 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 23 May 2013 at 14:54, Dennis Monticelli wrote:
>
> > For a marker you could use a level triggered one-shot.  I think it is
> > possible to wire up a single IC comparator to do this, If not a dual
> > comparator should do the trick.  The sawtooth ramp would feed the
> > comparator.
>
> Wouldn't I feed the comparator with a signal from an independent signal
> generator, so I can "move" it back and forth across the passband?
>
> >  For two independent markers a quad comparator could be
> > used.
>
> OK. Thanks. I'll dig some info out.
>
> Ken W7EKB
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